The idea works up to unregged CO2 pressure, as I have tested, above that the QEV might explode.It just needed one hell of a hit to fire.

The bottom picture should make things clear.For the T bolt I just positioned the hammer valve differently and turned the QEV 90 degrees.As seen here:

Here you can see the original simpler set up.A hammer valve (homemade) actuates a QEV, wich has a spring to reset it and a small equalisation hole in the piston.It can be filled ( and thus reset) from chamberside now.

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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!